From an artistic point of view, tuning is the pursuit of the beauty of harmonious proportions, which is equivalent to the harmony of colors that can be seen by the naked eye, and the preparation before the artist has started to write. When the tuner was sitting in front of the piano, he began to concentrate on pressing the first key. The moment he touched the key, he clearly saw the hammer inside the piano rushing forward and hitting the strings. The frequency of the vibratio